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Group 1. Through the selection of proxy variables
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Arora et al. [7], Brahm & Tarziján [8], De & Nagaraj [11], Horta & Lacy [56], Plotnikova [9], Qin & Buccola [57], Shakina & Barajas [10]
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Group 2. Analysis of multi-product cost functions
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Agasisti & Johnes [14], Duch-Brown & Parellada-Sabata [18], Fu et al. [58], Johnes & Johnes [15], Johnes & Schwarzenberger [16], Longlong et al. [59], Mamun [19], Martins et al. [20], Sav [17], Sav [13], Worthington & Higgs [60]
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Group 3. Analysis of multi-product production functions
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Bonaccorsi et al. [27], Cardamone [28], Chavas et al. [21], De Witte et al. [26], Ferrier et al. [24], Ferrier et al. [25], Hadad et al. [29], Podinovski & Førsund [30], Pope & Johnson [23], Ray [61], Schubert [22], Yip et al. [62]
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Others
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Cho & McCardle [63] (discrete-time infinite-horizon model for a technology-purchasing firm),
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Mayer-Haug et al. [64] (meta-analysis)
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Nemoto & Furumatsu [65] (input distance function approach)
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Olivares & Wetzel [51], Oh et al. [66] (comparison between a parametric production function approach and a nonparametric approach)
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Saal et al. [67] (summary of various methodologies)
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